US Signals Heavy Bomber Strike on Iran's Pickaxe Mountain Nuclear Facility

The United States has formally notified Israel that it plans to strike Iran's deeply buried Pickaxe Mountain nuclear facility "within days," deploying medium-to-heavy bombers for the first time in the current campaign. President Donald Trump has escalated public threats, and the US has surged aerial refueling tankers to Israeli airports to extend the strike range of American bomber packages. This article provides a fact-checked briefing on the key developments, the facility's specifications, and the expert assessments that raise questions about whether a single strike can succeed.

US Notification to Israel of Imminent Heavy Bomber Strikes

On July 22, 2026, Israel's public broadcaster Kan reported that the United States formally notified Israel it would strike Iran's secret underground nuclear facility at Pickaxe Mountain "within days." The U.S. informed Israel it intends to "raise the level of strikes" and deploy medium-to-heavy bombers for the mission .

The U.S. has surged aerial refueling tankers to Israeli airports (Ben Gurion and Ramon) — approximately 60 KC-46A and other tankers are now stationed there — to extend the strike range of American bomber packages targeting Pickaxe Mountain . Israeli officials assessed that Trump is preparing to "significantly escalate" U.S. strikes on Iranian nuclear sites including Pickaxe Mountain, and Israel has maintained its "highest level of readiness" since receiving the notice .

Trump's Escalating Rhetoric

President Trump has escalated public threats significantly since mid-July 2026:

• On July 13, 2026, Trump publicly declared: "We're going to take out Pickaxe Mountain" .
• On July 21, 2026, Trump warned he may intensify the conflict by "reverting to its origins" and targeting an unfinished Iranian nuclear facility with a bunker-busting strike — explicitly referencing Pickaxe Mountain .
• On July 23, 2026, Trump threatened to bomb one Iranian bridge or power plant for each attack on shipping in the Strait of Hormuz, and reiterated his threat to go after Iranian nuclear infrastructure .
• Trump has ramped up U.S. airstrikes over successive nights, with the U.S. launching strikes for the 11th consecutive night as of July 23, 2026 .
• In May 2026, Trump warned Iran would be bombed at "a much higher level" if it failed to reach a peace deal . In June 2026, he authorized new assaults on Iranian targets after accusing Tehran of refusing to negotiate .

Pickaxe Mountain Facility Specifications and Location

Pickaxe Mountain (translation of the Farsi name Kuh-e Kolang Gaz La) is located approximately 1 mile (1.6–2 km) south of Iran's Natanz uranium enrichment facility in central Iran, near a peak of the Zagros Mountains .

The facility is buried more than 300 feet (over 90 meters) beneath solid granite rock, making it significantly deeper than the Fordow enrichment plant . The facility remains under construction and unfinished as of late July 2026. Satellite imagery from June 15, 2026, shows active construction at the site .

Tunnels are bored into the mountain, with the complex designed to house centrifuge operations beyond the reach of conventional airstrikes.

Construction Activity in Violation of Ceasefire Terms

Satellite imagery analysis by the Foundation for Defense of Democracies (FDD) dated July 8, 2026, confirms Iran is continuing construction at Pickaxe Mountain in violation of the U.S.-Iran Memorandum of Understanding (MOU). The MOU was intended to freeze nuclear-related construction .

The Center for Strategic and International Studies (CSIS) found that Iran has continued construction at Pickaxe Mountain, including possible signs of renewed nuclear activity, despite diplomatic agreements .

Israeli intelligence believes Iran has moved thousands of uranium-enrichment centrifuges into the Pickaxe Mountain complex, raising fears that Tehran is rebuilding its nuclear program beyond the reach of inspectors and conventional airstrikes .

Expert Assessments of Iran's Nuclear Weapons Ambitions

U.S. intelligence agencies concluded in March 2025 that Iran was "not developing a nuclear weapon." However, the Trump administration initiated airstrikes on Iranian nuclear sites in June 2025 anyway .

After the June 2025 strikes (Operation Midnight Hammer, which hit Fordow, Natanz, and Isfahan), Iran increased construction at Pickaxe Mountain, indicating a strategic shift to harder-to-reach facilities .

Experts at the Bulletin of the Atomic Scientists assessed that Trump's "nuclear blackmail" strategy has failed to extract concessions from Tehran, and that escalating strikes risk pushing Iran closer to breakout capability .

Significantly, nonproliferation experts note that Pickaxe Mountain's extreme depth likely places it beyond the effective range of even the U.S. GBU-57 Massive Ordnance Penetrator (MOP), raising doubts about whether a single strike could fully destroy the facility .

Iran's Denial of Secret Nuclear Activities

Since 2021, the Islamic Republic has maintained that Pickaxe Mountain is a centrifuge manufacturing facility — not an enrichment or weapons site — and has denied that it harbors any secret nuclear activities .

Iran's nuclear chief stated that the site is for producing centrifuge rotors and other non-sensitive equipment. Western intelligence agencies and the IAEA have expressed skepticism, citing the facility's extreme depth, military-grade fortification, and proximity to Natanz as inconsistent with a purely civilian manufacturing role.

Iran has warned the U.S. against targeting its infrastructure, threatening reprisals, and has retaliated against U.S. and allied assets in the region in response to American strikes .

Bottom line: The U.S. has notified Israel of an imminent heavy bomber strike on Iran's Pickaxe Mountain facility. Trump has publicly declared the site will be "taken out," and the U.S. has surged refueling aircraft to Israel to enable the mission. The facility is buried more than 300 feet under granite, remains under construction in violation of ceasefire terms, and may now house thousands of centrifuges moved from above-ground plants. Iran denies any secret weapons activity, claiming it is a centrifuge manufacturing facility.